1977 13-footer Yamaha F40

Optimizing the performance of Boston Whaler boats
Warren
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1977 13-footer Yamaha F40

Postby Warren » Thu Jul 09, 2020 12:56 am

Suggest a propeller for an 1977 13-footer with a 2011 Yamaha F40. The boat is heavy with a 12-gallon fuel tank, a 14-gallon bait tank, two people with fishing equipment, and a cooler.

The current propeller is an aluminum Quicksilver three-blade 10-5/8 x 12-pitch.

Top boat speed on July 8, 2020 in freshwater was 29.5-MPH at 5800-RPM.

I would like to purchase two more propellers for different conditions:
—to be able to troll slower so I don’t have to tow buckets, and
—for offshore runs.

I may buy a stainless steel propeller or a four-blade propeller.

Suggest propeller for these purposes and my boat and engine.

Thanks—Warren

biggiefl
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Re: 1977 13-footer Yamaha F40

Postby biggiefl » Thu Jul 09, 2020 10:25 am

Keep the propeller you have or upgrade to a stainless steel propeller.

Your top boat speed is slow for a 40-HP engine.
On my 24th Whaler. Currently in the stable: 86 18' Outrage, 81 13' Sport(original owner), 87 11' Sport, 69 Squall(for sale cheap).

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Phil T
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Re: 1977 13ft with 40hp Yamaha 4 stroke prop

Postby Phil T » Thu Jul 09, 2020 11:21 am

10-5/8" x 13" Yamaha Painted Stainless Steel, Yamaha part # 663-45974-02-00

10-1/2" x 12" Yamaha Performance Series 3-Blade, Yamaha part # MAR-GYT38-03-12

10-7/8" x 12" Amita 4
1992 Outrage 17
2019 E-TEC 90
2018 LoadRite 18280096VT
Member since 2003

Warren
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Re: 1977 13ft with 40hp Yamaha 4 stroke prop

Postby Warren » Thu Jul 09, 2020 12:55 pm

Thanks for the propeller suggestions.

What WOT and idle speeds should I expect with each propeller that has been suggested?

I had a PRO TECH propeller on a TOHATSU 40-HP engine [on an unidentified boat]. That propeller had to be worked on to remove blade cup because [the TOHATSU 40-HP engine] idled too fast and was at the low rpm range.

biggiefl
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Re: 1977 13-footer Yamaha F40

Postby biggiefl » Thu Jul 09, 2020 1:07 pm

My 1981 13-footer with a SUZUKI DF40 does 38-MPH with just me in the boat.
On my 24th Whaler. Currently in the stable: 86 18' Outrage, 81 13' Sport(original owner), 87 11' Sport, 69 Squall(for sale cheap).

Warren
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Re: 1977 13ft with 40hp Yamaha 4 stroke prop

Postby Warren » Thu Jul 09, 2020 3:35 pm

Thanks Biggiefl. In saltwater the most I get is 33.5

I really hope I can find the perfect prop to buy for my setup.

I also have a 25lbs of lead shot in the forward anchor compartment for ballast.

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Phil T
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Re: 1977 13ft with 40hp Yamaha 4 stroke prop

Postby Phil T » Thu Jul 09, 2020 4:05 pm

Given all the weight in the boat, you are not far off as it is.
1992 Outrage 17
2019 E-TEC 90
2018 LoadRite 18280096VT
Member since 2003

Warren
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Re: 1977 13-footer Yamaha F40

Postby Warren » Thu Jul 09, 2020 10:23 pm

[Engine speed at] WOT is right on. I just want a trolling propeller so I don't have to drag buckets to slow down.

An offshore saltwater stainless propeller would be nice.

Actually I think my main goal is to dump more money into my classic 13-footer.

I’m on the waiting list with the canvas lady to make me a custom stainless Bimini.

I’ll get real performance numbers on the evening ofJuly 10, 2020, when I will take out the boat for angling.

biggiefl
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Re: 1977 13-footer Yamaha F40

Postby biggiefl » Fri Jul 10, 2020 9:45 am

I keep two dive belts in the forward locker as well.
On my 24th Whaler. Currently in the stable: 86 18' Outrage, 81 13' Sport(original owner), 87 11' Sport, 69 Squall(for sale cheap).

jimh
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Re: 1977 13-footer Yamaha F40

Postby jimh » Fri Jul 10, 2020 10:02 am

To reduce boat speed at minimum engine idle speed, reduce propeller pitch from the current propeller pitch. But be observant of recommend engine speed limit at high throttle settings, as the engine will be able to accelerate to more than the recommended maximum speed with a low-pitch propeller.

I don’t understand what criteria you imply with your intended use “for offshore.” A 13-footer won’t be going too far from the shore.

There is no magic in a four-blade propeller for a 40-HP engine.

For a 40-HP engine an aluminum propeller is generally sufficiently strong. A steel propeller may have thinner blades and give improved performance at high throttle.

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Phil T
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Re: 1977 13-footer Yamaha F40

Postby Phil T » Fri Jul 10, 2020 12:25 pm

You will not solve the trolling speed concern with a prop change. That is painting a pig.

Consider a trolling plate.

https://www.davisinstruments.com/product/happy-troller-small/
1992 Outrage 17
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Re: 1977 13-footer Yamaha F40

Postby jimh » Fri Jul 10, 2020 7:03 pm

Troll in reverse.

Warren
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Re: 1977 13-footer Yamaha F40

Postby Warren » Sat Jul 11, 2020 3:42 am

I did consider a trolling plate but I won’t use it enough to make it worth drillng more holes in the [anti-ventilation] plate. I already have a hydrofoil installed.

And I did try reverse for a while but the rod holders are mounted on the transom and the wind made it exhausting to control.

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Jefecinco
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Re: 1977 13-footer Yamaha F40

Postby Jefecinco » Sat Jul 11, 2020 10:19 am

Given the responses to your question towing a bucket may be your best solution. It may be inelegant but it is effective and virtually free.
Butch

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Re: 1977 13-footer Yamaha F40

Postby biggiefl » Mon Jul 13, 2020 12:08 pm

Find faster fish!
On my 24th Whaler. Currently in the stable: 86 18' Outrage, 81 13' Sport(original owner), 87 11' Sport, 69 Squall(for sale cheap).

Warren
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Re: 1977 13-footer Yamaha F40

Postby Warren » Sat Jul 25, 2020 5:09 pm

I do catch faster fish, I’ve been 40 miles offshore and caught bluefin tuna from my 13ft whaler.

It was pretty choppy seas but I got a WOT of 6,000 rpm’s and 32.9mph.

This is the marking on my current prop. (It’s very hard to read) Any suggestions if I should go up in size or pitch? I have room to go up in diameter.

I googled the # and was not able to find the exact #. I’m going to try and call quicksilver on Monday.
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Jefecinco
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Re: 1977 13-footer Yamaha F40

Postby Jefecinco » Sun Jul 26, 2020 11:21 am

Warren - That sounds fishy. Did the tuna fit in your cooler?
Butch

Warren
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Re: 1977 13-footer Yamaha F40

Postby Warren » Tue Jul 28, 2020 9:00 pm

Jeff. I normally release them but when I keep fish I use a “Kill Bag”

You can see it behind me on the deck of the boat. I used to use a cooler but it takes up too much space and does not have the capacity of the bag....Warren

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Warren
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Re: 1977 13-footer Yamaha F40

Postby Warren » Mon Aug 24, 2020 12:50 am

Jefecinco. Does it still sound “Fishy”? Or do my pics make it believable?

Jefecinco
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Re: 1977 13-footer Yamaha F40

Postby Jefecinco » Mon Aug 24, 2020 9:46 am

Believable but I'm amazed. Beautiful fish.
Butch